Switching powersupplies work best between 40 and 60 % load.The PFC , cooling , fan cycles etc are all best at this range.........So if I wanna run 2 high end folding cards/cpu etc , for my rig , 1 kW is more in line.....

If you want a 1KW PSU go for the Corsair 1000HX or the one I just got, the Enermax Revolution85+ 1050W (also a 950W and 850W available). The Enermax has up to 90% efficiency between 200W and 1000W (but is expensive, $300). The Corsair is a better value, and is almost as good (not as efficient).

I'm seeing the pausing in the display too. the performance indicator spikes and quickly drops to 0 - the time and graphics change along with it. And it's taking forever to to a unit.

It is highly recommended that you Do NOT use the display/viewer that comes with the systray client as it is known to slow down the client and/or cause system instability. If you haven't already I would increase the priority from 'Lowest Possible' to 'Slightly Higher' under the advanced tab to make sure the client gets enough CPU cycles...